At LINE Yahoo Corporation, I build backend services and run production reliability at LINE and Yahoo Japan scale. I architected API v3 to unify platforms, reaching 8,000 TPS on Redirector and 500 TPS on URLMaker.
I implemented a Kafka-based Double-Write migration of 10 billion records across heterogeneous clouds with zero downtime and 100% data integrity. I also designed daily data purging for a multi-billion-record database to reduce storage costs and improve query efficiency.
As an SRE, I manage Kubernetes and ArgoCD deployments that support 99.9% uptime, and maintain Prometheus/Grafana monitoring alongside internal observability tools. I've also migrated deployment, centralized logging, and secrets-management systems for LINE Healthcare.
I enjoy building practical prototypes, from AI assistants for the LINE Fortune app to a Zoom transcription bot and documentation automation that earned the LTV Quarterly Excellence Award. Earlier, I built e-learning and meeting-room booking applications using React Native, Laravel, Spring Boot, MySQL, and Google Calendar API.
